Germ-line chromosome of Parascaris equorum is

Options

A. Monocentric
B. Dicentric
C. Polycentric
D. Holocentric.

Answer

To determine the type of germ-line chromosome of Parascaris equorum, we will analyze the options provided and understand the definitions of each type of chromosome.

### Step-by-Step Solution:

1. **Understand the Types of Chromosomes**:
- **Monocentric (Monosantric)**: This type of chromosome has a single centromere. It is characterized by having only one point of attachment for spindle fibers during cell division.
- **Dicentric (Disanthric)**: This chromosome has two centromeres. It can lead to complications during cell division as the spindle fibers may pull in different directions.
- **Polycetric (Polysanthric)**: This type has multiple centromeres along the length of the chromosome.
- **Holocentric (Holocentric)**: In holocentric chromosomes, kinetochores are distributed along the entire length of the chromosome, allowing for multiple points of attachment for spindle fibers.

2. **Identify the Germ-line Chromosome of Parascaris equorum**:
- The germ-line chromosome of Parascaris equorum is known to be holocentric. This means that it has kinetochores distributed along its length, which is a characteristic feature of holocentric chromosomes.

3. **Select the Correct Option**:
- Based on the definitions and characteristics discussed, the correct answer to the question is **holocentric**.

### Final Answer:
The germ-line chromosome of Parascaris equorum is **holocentric**.

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